Why is it so hard to find someone to file form 5472?

I'm a non-US resident with a single-member US LLC, and I assumed finding someone to handle Form 5472 would be one of the easier parts of staying compliant. Instead, it's turned into hours of searching with very little to show for it.

Every provider I come across seems to fall into one of two categories. Either they have very little information or few reviews, or they charge what feels like a surprisingly high fee for what appears to be a fairly specific filing.

Since the penalties for getting it wrong are significant, I'm hesitant to simply choose the cheapest option and hope for the best. I'm happy to pay a fair price for someone experienced with non-US-owned LLCs, but I'd really like to work with someone reputable who regularly handles these filings rather than taking a chance on a random service online.

Who can you recommend based on your experience?